CN114200013A - Contact net operation wheel pair axle phased array detection method - Google Patents
Contact net operation wheel pair axle phased array detection method Download PDFInfo
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- CN114200013A CN114200013A CN202010977326.5A CN202010977326A CN114200013A CN 114200013 A CN114200013 A CN 114200013A CN 202010977326 A CN202010977326 A CN 202010977326A CN 114200013 A CN114200013 A CN 114200013A
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- 238000001514 detection method Methods 0.000 title claims abstract description 105
- 238000012360 testing method Methods 0.000 claims abstract description 102
- 239000000523 sample Substances 0.000 claims abstract description 87
- 230000007547 defect Effects 0.000 claims abstract description 39
- 238000004088 simulation Methods 0.000 claims abstract description 17
- 239000007822 coupling agent Substances 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000003550 marker Substances 0.000 claims abstract description 5
- 239000010705 motor oil Substances 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 238000003384 imaging method Methods 0.000 claims description 14
- 230000035945 sensitivity Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 238000012795 verification Methods 0.000 claims description 6
- 238000002050 diffraction method Methods 0.000 claims description 3
- 238000010892 electric spark Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 235000012431 wafers Nutrition 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/26—Scanned objects
- G01N2291/269—Various geometry objects
- G01N2291/2696—Wheels, Gears, Bearings
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- Acoustics & Sound (AREA)
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Abstract
The invention discloses a contact net operation wheel pair axle phased array detection method, which comprises the following steps: s1 selection of detection device, coupling agent and auxiliary tool: s11 ultrasonic phased array equipment, a probe and a test block; the ultrasonic phased array equipment is a pulse reflection type instrument, and the working frequency range of the ultrasonic phased array equipment is 1 MHz-10 MHz; the probe adopts a linear phased array probe; the test block is divided into a calibration test block, a reference test block and a simulation defect test block; the S12 couplant is engine oil; the S13 detection assistance tool includes: ruler, steel tape, external caliper, calculator, wiping paper, marker pen; and S2 detecting the wheel seat embedding part, the unloading groove part, the brake disc seat and the tooth seat part of the working wheel pair. The technology of the invention is reasonably applied to axle detection of the large-scale road maintenance machinery contact net operation vehicle, selects reasonable probes, selects the best detection position for detection, improves the detection efficiency, can flexibly detect a single position, and can cover the full axle position by one-time detection.
Description
Technical Field
The invention relates to the technical field of axle detection, in particular to a contact net operation wheel pair axle phased array detection method.
Background
The existing axle is added with the test block in kind and depends on the import, the cost is very high, the test block is various, almost every kind of operation car corresponds to one test block, a large amount of waste is caused, the existing test block adopts the test block with a whole axle, the weight is large, the size is large, the detection part is repeated, and simultaneously, the existing test block model can not cover the axle type of all vehicles.
The existing detection method is operated by controlling the angle to detect, but the angle is usually required to be accurate to 0.1 degree, the requirement on precision is too high, the actual detection operation is inconvenient, the probes are difficult to manufacture, calibrate and use, and the technical requirement on personnel is high, and meanwhile, during detection, six probes are required to be used and fixed at six different positions to detect the detection part corresponding to each probe; the moving range is not available, the detection efficiency is greatly reduced, the detection difficulty is increased, and the angle of the probe needs to be adjusted again during each detection; six probes are used for detecting six fixed positions, although the probes have diffusion angles, the detection sensitivity still cannot meet the detection requirement, and parts are easily missed and mistakenly detected at certain positions, so that misjudgment is caused.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a contact net operation wheel pair axle phased array detection method.
The invention provides a contact net operation wheel pair axle phased array detection method, which comprises the following steps:
s1 selection of detection device, coupling agent and auxiliary tool:
s11 ultrasonic phased array equipment, a probe and a test block;
the ultrasonic phased array equipment is a pulse reflection type instrument, and the working frequency range of the ultrasonic phased array equipment is 1 MHz-10 MHz; the probe adopts a linear phased array probe; the test block is divided into a calibration test block, a reference test block and a simulation defect test block;
the S12 couplant is engine oil;
the S13 detection assistance tool includes: ruler, steel tape, external caliper, calculator, wiping paper, marker pen;
s2 detecting the wheel seat embedding part, the unloading groove part, the brake disc seat and the tooth seat part of the working wheel pair, and scanning the end surface of the axle or the axle body according to the actual detection condition;
and S3, debugging the instrument according to the specification before starting the operation: connecting a 64:64 phased array probe according to the requirement of a detection part;
s31, adjusting the scanning angle of the probe to make the scanning range of the probe cover the part to be detected;
s32, placing the probe on the object test block, and adjusting the detection sensitivity to clearly display the artificial defects;
s33 gains 6dB on the basis of the detection sensitivity, couples 0-6 dB, and takes the gain as the detection sensitivity of each part of the axle phased array;
s4 full-axis detection, namely, using an ultrasonic phased array sector scanning imaging method to place phased array probes at the end face and the axle body of the axle to carry out sector scanning record on the wheel seat embedding part of the axle;
s41, placing the phased array probe on the end face of a shaft for detection, wherein a detection area covers a shaft diameter unloading groove, a wheel seat embedding part, a brake disc seat, a shaft body and a gear seat, namely all defects on the half shaft real object test block are detected, the left side and the right side of the shaft end are respectively detected, namely the detection range covers the whole shaft;
s42, placing the phased array probe on a shaft body for detection, wherein a detection area covers a shaft diameter unloading groove, a wheel seat embedding part, a brake disc seat, the shaft body and a gear seat, namely all defects on the half shaft real object test block are detected, the left side and the right side of the probe are respectively detected, namely the detection range covers the whole shaft;
s5 single site detection:
s51, a probe is placed at the shaft diameter part, and the shaft diameter unloading groove, the wheel seat and the brake disc can be detected independently or integrally;
s52, a probe is placed at the shaft body position, and the shaft diameter unloading groove, the wheel seat, the brake disc and the gear seat can be independently detected;
s6 probe movement:
s61 shaft end movement: scanning by placing the probe on the shaft end surface coated with the coupling agent, wherein the probe is uniformly stressed by 2-5N and moves in a graph mode at the speed of 20-50 mm/s, namely moves along the circumferential direction;
s62, moving the shaft body and the shaft neck: and (3) scanning the probe on the shaft body and the shaft neck coated with the coupling agent, wherein the probe is uniformly stressed by 2-5N and moves in a graph mode at the speed of 20-50 mm/s, namely moves along the circumferential direction.
Preferably, the calibration test block is used for testing the performance of the ultrasonic phased array detection system and adjusting gain compensation, and the calibration test block adopted by the standard is a CSK-IA test block and a sound beam control evaluation test block.
Preferably, the reference block is used for detecting a calibrated block, and the reference blocks adopted by the standard include PRB-I, PRB-II, PRB-III, PRB-IV, PRB-V, GD series blocks, SGB series blocks and AUT blocks.
Preferably, the external dimension of the reference test block should represent the characteristics of the workpiece to be detected, the thickness of the test block should correspond to the thickness of the workpiece to be detected, and if the detection of the welding joint of two or more parts with different thicknesses is involved, the thickness of the test block should be determined by the maximum thickness of the test block.
Preferably, the simulation defect test block is used for detection process verification and ultrasonic phased array transverse wave end point diffraction method height measurement skill verification. The simulation test block should meet the following requirements:
a) the simulation defect test block is generally manufactured by adopting electric sparks, and the defect type of the simulation defect test block is a typical fatigue defect which is easy to appear in a detected workpiece;
b) the defect positions in the simulated defect test block should be representative.
Preferably, the ultrasonic phased array device is an imaging instrument, and the display mode of the ultrasonic phased array device is divided into two modes of displaying and imaging according to a sound path and displaying and imaging according to an actual geometrical structure.
Preferably, the scanning types of step S4 are divided into electronic scanning and sector scanning.
According to the method for detecting the axle phased array of the contact net operation vehicle wheel pair, when an actual axle is detected, all detection can be carried out as long as the probes are respectively placed at the two ends, the technology is reasonably applied to axle detection of the large-scale road maintenance machinery contact net operation vehicle, the reasonable probes are selected, the optimal detection position is selected for detection, the detection efficiency is improved, a single position can be flexibly detected, and the position of the whole axle can be covered by one-time detection.
Drawings
FIG. 1 is a block diagram of a CSK-IA standard test block;
FIG. 2 is a block diagram of acoustic beam control assessment;
FIG. 3 is a PRB-I block diagram;
FIG. 4 is a PRB-II block diagram;
FIG. 5 is a PRB-III block diagram;
FIG. 6 is a PRB-IV block diagram;
FIG. 7 is a PRB-V block diagram;
FIG. 8 is a block diagram of a contact net vehicle axle shaft;
FIG. 9 is a schematic view of detection;
FIG. 10 is an imaging interface introduction view;
FIG. 11 is a schematic representation of the artificial defect energy;
FIG. 12 is a graph of the filtered image results;
FIG. 13 is an axial end view;
FIG. 14 is a perspective view of the axle body;
FIG. 15 is a perspective view of the shaft diameter portion;
FIG. 16 is a front view of the shaft position detection;
FIG. 17 is a rear view of the shaft position detection;
FIG. 18 is a view of the probe scanning at the axial end face;
FIG. 19 is a view showing a scanning pattern of the probe on the shaft body and the journal.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-19, the contact net operation wheel pair axle phased array detection method comprises the following steps:
s1 selection of detection device, coupling agent and auxiliary tool:
s11 ultrasonic phased array equipment, a probe and a test block;
the ultrasonic phased array equipment is a pulse reflection type instrument, and the working frequency range of the ultrasonic phased array equipment is 1 MHz-10 MHz; the probe adopts a linear phased array probe; the test block is divided into a calibration test block, a reference test block and a simulation defect test block;
the S12 couplant is engine oil;
the S13 detection assistance tool includes: ruler, steel tape, external caliper, calculator, wiping paper, marker pen;
s2 detecting the wheel seat embedding part, the unloading groove part, the brake disc seat and the tooth seat part of the working wheel pair, and scanning the end surface of the axle or the axle body according to the actual detection condition;
and S3, debugging the instrument according to the specification before starting the operation: connecting a 64:64 phased array probe according to the requirement of a detection part;
s31, adjusting the scanning angle of the probe to make the scanning range of the probe cover the part to be detected;
s32, placing the probe on the object test block, and adjusting the detection sensitivity to clearly display the artificial defects;
s33 gains 6dB on the basis of the detection sensitivity, couples 0-6 dB, and takes the gain as the detection sensitivity of each part of the axle phased array;
s4 full-axis detection, namely, using an ultrasonic phased array sector scanning imaging method to place phased array probes at the end face and the axle body of the axle to carry out sector scanning record on the wheel seat embedding part of the axle;
s41, placing the phased array probe on the end face of a shaft for detection, wherein a detection area covers a shaft diameter unloading groove, a wheel seat embedding part, a brake disc seat, a shaft body and a gear seat, namely all defects on the half shaft real object test block are detected, the left side and the right side of the shaft end are respectively detected, namely the detection range covers the whole shaft;
s42, placing the phased array probe on a shaft body for detection, wherein a detection area covers a shaft diameter unloading groove, a wheel seat embedding part, a brake disc seat, the shaft body and a gear seat, namely all defects on the half shaft real object test block are detected, the left side and the right side of the probe are respectively detected, namely the detection range covers the whole shaft;
s5 single site detection:
s51, a probe is placed at the shaft diameter part, and the shaft diameter unloading groove, the wheel seat and the brake disc can be detected independently or integrally;
s52, a probe is placed at the shaft body position, and the shaft diameter unloading groove, the wheel seat, the brake disc and the gear seat can be independently detected;
s6 probe movement:
s61 shaft end movement: scanning by placing the probe on the shaft end surface coated with the coupling agent, wherein the probe is uniformly stressed by 2-5N and moves in a graph mode at the speed of 20-50 mm/s, namely moves along the circumferential direction;
s62, moving the shaft body and the shaft neck: and (3) scanning the probe on the shaft body and the shaft neck coated with the coupling agent, wherein the probe is uniformly stressed by 2-5N and moves in a graph mode at the speed of 20-50 mm/s, namely moves along the circumferential direction.
In the invention, the calibration test block is used for testing the performance of the ultrasonic phased array detection system and adjusting the gain compensation, and the calibration test block adopted by the standard is a CSK-IA test block and a sound beam control evaluation test block.
In the invention, the reference block is used for detecting and calibrating a test block, and the reference blocks adopted by the standard comprise PRB-I, PRB-II, PRB-III, PRB-IV, PRB-V, GD series test blocks, SGB series test blocks and AUT test blocks.
In the invention, the external dimension of the reference test block can represent the characteristics of the detected workpiece, the thickness of the test block corresponds to the thickness of the detected workpiece, and if the detection of the welding joint of two or more parts with different thicknesses is involved, the thickness of the test block is determined by the maximum thickness of the test block.
In the invention, the simulation defect test block is used for testing process verification and ultrasonic phased array transverse wave end point diffraction method height measurement skill verification. The simulation test block should meet the following requirements:
a) the simulation defect test block is generally manufactured by adopting electric sparks, and the defect type of the simulation defect test block is a typical fatigue defect which is easy to appear in a detected workpiece;
b) the defect positions in the simulated defect test block should be representative.
In the invention, the ultrasonic phased array equipment is an imaging instrument, and the display mode of the ultrasonic phased array equipment is divided into two modes of displaying and imaging according to a sound path and displaying and imaging according to an actual geometric structure.
In the present invention, the scanning types of step S4 are divided into electronic scanning and sector scanning.
Phased array probe parameters:
a) wafer parameters: number of wafers, width of wafers, wafer gap, and wafer unit width.
b) Wedge parameters: wedge size, wedge angle, and wedge sound velocity.
4.8.2 delay law parameter
a) Number of wafers: the number of wafers used for the delay algorithm is set.
b) Wafer position: the starting position of the excitation wafer is set.
c) Angle parameters: the fixed angle of the acoustic beam used in the workpiece, the angular range of the acoustic beam is set.
d) Distance parameters: setting the acoustic path or depth in the workpiece.
e) Sound velocity parameters: the sound velocity in the workpiece is set, for example, transverse wave sound velocity and longitudinal wave sound velocity.
f) Thickness of the workpiece: and setting the thickness of the detected workpiece.
g) When the focused acoustic beam is adopted for detection, the focusing acoustic path or depth is set, and the size of the focal column is measured.
The invention comprises the following steps: selection of detection device, coupling agent and auxiliary tool: ultrasonic phased array equipment, a probe and a test block; the ultrasonic phased array equipment is a pulse reflection type instrument, and the working frequency range of the ultrasonic phased array equipment is 1 MHz-10 MHz; the probe adopts a linear phased array probe; the test block is divided into a calibration test block, a reference test block and a simulation defect test block; the coupling agent is engine oil; the detection aid includes: ruler, steel tape, external caliper, calculator, wiping paper, marker pen; detecting the wheel seat embedding part, the unloading groove part, the brake disc seat and the tooth seat part of the operating wheel pair, and scanning on the end surface of the axle or the axle body according to actual detection conditions; debugging the instrument according to the regulation before the start of work: connecting a 64:64 phased array probe according to the requirement of a detection part; adjusting the scanning angle of the probe to enable the scanning range of the probe to cover the part to be detected; placing the probe on a real object test block, and adjusting the detection sensitivity to clearly display the artificial defects; on the basis of the detection sensitivity, the gain is 6dB, and the coupling is 0-6 dB, so that the detection sensitivity of each part of the axle phased array is taken as the detection sensitivity; performing full-axis detection, namely placing phased array probes at the end face and the axle body of the axle by using an ultrasonic phased array sector scanning imaging method to perform sector scanning record on the wheel seat embedding part of the axle; placing a phased array probe on the end face of a shaft for detection, wherein a detection area covers a shaft diameter unloading groove, a wheel seat embedding part, a brake disc seat, a shaft body and a gear seat, namely all defects on a half shaft real object test block are detected, the left side and the right side of the shaft end are respectively detected, namely the detection range covers the whole shaft; placing a phased array probe on a shaft body for detection, wherein a detection area covers a shaft diameter unloading groove, a wheel seat embedding part, a brake disc seat, the shaft body and a gear seat, namely all defects on a half shaft real object test block are detected, the left side and the right side of the probe are respectively detected, namely the detection range covers the whole shaft; single site detection: the probe is arranged at the shaft diameter part, and can be used for independently detecting a shaft diameter unloading groove, a wheel seat and a brake disc and also can be used for integrally detecting; a probe is arranged at the position of the shaft body, and the positions of the shaft diameter unloading groove, the wheel seat, the brake disc and the gear seat can be independently detected; moving the probe: shaft end movement: scanning by placing the probe on the shaft end surface coated with the coupling agent, wherein the probe is uniformly stressed by 2-5N and moves in a graph mode at the speed of 20-50 mm/s, namely moves along the circumferential direction; the shaft body and the shaft neck move: and (3) scanning the probe on the shaft body and the shaft neck coated with the coupling agent, wherein the probe is uniformly stressed by 2-5N and moves in a graph mode at the speed of 20-50 mm/s, namely moves along the circumferential direction.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The method for detecting the phased array of the wheel pair shaft of the contact network operation wheel is characterized by comprising the following steps of:
s1 selection of detection device, coupling agent and auxiliary tool:
s11 ultrasonic phased array equipment, a probe and a test block;
the ultrasonic phased array equipment is a pulse reflection type instrument, and the working frequency range of the ultrasonic phased array equipment is 1 MHz-10 MHz; the probe adopts a linear phased array probe; the test block is divided into a calibration test block, a reference test block and a simulation defect test block;
the S12 couplant is engine oil;
the S13 detection assistance tool includes: ruler, steel tape, external caliper, calculator, wiping paper, marker pen;
s2 detecting the wheel seat embedding part, the unloading groove part, the brake disc seat and the tooth seat part of the working wheel pair, and scanning the end surface of the axle or the axle body according to the actual detection condition;
and S3, debugging the instrument according to the specification before starting the operation: connecting a 64:64 phased array probe according to the requirement of a detection part;
s31, adjusting the scanning angle of the probe to make the scanning range of the probe cover the part to be detected;
s32, placing the probe on the object test block, and adjusting the detection sensitivity to clearly display the artificial defects;
s33 gains 6dB on the basis of the detection sensitivity, couples 0-6 dB, and takes the gain as the detection sensitivity of each part of the axle phased array;
s4 full-axis detection, namely, using an ultrasonic phased array sector scanning imaging method to place phased array probes at the end face and the axle body of the axle to carry out sector scanning record on the wheel seat embedding part of the axle;
s41, placing the phased array probe on the end face of a shaft for detection, wherein a detection area covers a shaft diameter unloading groove, a wheel seat embedding part, a brake disc seat, a shaft body and a gear seat, namely all defects on the half shaft real object test block are detected, the left side and the right side of the shaft end are respectively detected, namely the detection range covers the whole shaft;
s42, placing the phased array probe on a shaft body for detection, wherein a detection area covers a shaft diameter unloading groove, a wheel seat embedding part, a brake disc seat, the shaft body and a gear seat, namely all defects on the half shaft real object test block are detected, the left side and the right side of the probe are respectively detected, namely the detection range covers the whole shaft;
s5 single site detection:
s51, a probe is placed at the shaft diameter part, and the shaft diameter unloading groove, the wheel seat and the brake disc can be detected independently or integrally;
s52, a probe is placed at the shaft body position, and the shaft diameter unloading groove, the wheel seat, the brake disc and the gear seat can be independently detected;
s6 probe movement:
s61 shaft end movement: scanning by placing the probe on the shaft end surface coated with the coupling agent, wherein the probe is uniformly stressed by 2-5N and moves in a graph mode at the speed of 20-50 mm/s, namely moves along the circumferential direction;
s62, moving the shaft body and the shaft neck: and (3) scanning the probe on the shaft body and the shaft neck coated with the coupling agent, wherein the probe is uniformly stressed by 2-5N and moves in a graph mode at the speed of 20-50 mm/s, namely moves along the circumferential direction.
2. The method for detecting the phased array of the wheel pair shaft of the contact net operation wheel according to claim 1, wherein the calibration test block is used for testing the performance of an ultrasonic phased array detection system and adjusting gain compensation, and the calibration test block adopted by the standard is a CSK-IA test block and a sound beam control evaluation test block.
3. The method for detecting the phased array of the wheel pair and the axle of the contact line work vehicle according to claim 1, wherein the reference test block is used for detecting a calibrated test block, and the reference test blocks adopted by the standard include PRB-I test blocks, PRB-II test blocks, PRB-III test blocks, PRB-IV test blocks, PRB-V test blocks, GD series test blocks, SGB series test blocks and AUT test blocks.
4. The phased array detection method for the axle of the contact net operation wheel pair as claimed in claim 1, wherein the external dimension of the reference test block is capable of representing the characteristics of the detected workpiece, the thickness of the test block is corresponding to the thickness of the detected workpiece, and if the detection of the welding joints of two or more parts with different thicknesses is involved, the thickness of the test block is determined by the maximum thickness of the test block.
5. The method for detecting the phased array of the wheel pair axle of the contact net operation wheel according to claim 1, wherein the simulation defect test block is used for detection process verification and ultrasonic phased array transverse wave end point diffraction method height measurement skill verification. The simulation test block should meet the following requirements:
a) the simulation defect test block is generally manufactured by adopting electric sparks, and the defect type of the simulation defect test block is a typical fatigue defect which is easy to appear in a detected workpiece;
b) the defect positions in the simulated defect test block should be representative.
6. The method for detecting the phased array of the wheel pair and the axle of the contact net operation wheel according to claim 1, wherein the ultrasonic phased array equipment is an imaging instrument, and the display mode of the ultrasonic phased array equipment is divided into two modes of displaying and imaging according to a sound path and displaying and imaging according to an actual geometric structure.
7. The method for detecting the phased array of the wheel pair axle of the overhead line system working vehicle as claimed in claim 1, wherein the scanning types of the step S4 are electronic scanning and sector scanning.
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